Enantioselective hydrogenation of α,β-unsaturated carboxylic acids over cinchonidine-modified Pd catalysts: effect of substrate structure on the adsorption mode

The preferential adsorption of α,β-unsaturated carboxylic acids during their enantioselective hydrogenation over cinchonidine-modified Pd catalysts is directed by the nature of the substituent (alkyl or aryl) situated in β position.